Volts To Watts Electrical Conversion Calculator

Convert volts to watts by entering the voltage and current in amps, or the resistance of the circuit in the form below.

ConvertVolts and Amps to WattsVolts and Ohms to Watts Voltagemillivoltsvoltskilovolts Currentmilliampsampskiloamps convert watts to voltsLeft/Right Arrow Icon Voltagemillivoltsvoltskilovolts Resistancemilliohmsohmskiloohms convert watts to voltsLeft/Right Arrow Icon Question Mark Icon ×Close dialog

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• Volts to Watts Calculator
• How to Convert Volts to Watts
• Volts to Watts Formula
• Conversion For AC Circuits
• Formula for AC Circuits
• Convert Volts to Watts using Resistance
• Equivalent Volts and Watts Measurements
• References

Person Icon By Joe Sexton

Joe is the creator of Inch Calculator and has over 20 years of experience in engineering and construction. He holds several degrees and certifications.

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Kevin Weekly holds a PhD in Electrical Engineering and Computer Science (EECS) from the University of California Berkeley and Bachelor's degrees in electrical engineering and computer science from the University of Texas.

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Sexton, J. (n.d.). Volts to Watts Conversion Calculator. Inch Calculator. Retrieved February 18, 2026, from https://www.inchcalculator.com/volts-to-watts-calculator/

Convert watts to volts

How to Convert Volts to Watts

Converting voltage, measured in volts, to power measured in watts is easy using the Watt’s Law power formula. Watt’s Law states that current is equal to power divided by voltage.

Multiplying both sides of this relationship by voltage, we can change this formula to also state that power is equal to voltage times current.

Volts to Watts Formula

This is the formula to convert volts to watts, using the current in amps:[1]

P(W) = V(V) × I(A)

Thus, the power P in watts it equal to the voltage V in volts times the current I in amps.

For example, let’s convert 12 volts to watts for a DC circuit with 2 amps of current.

P(W) = 12 V × 2 A P(W) = 24 watts

So, 12 volts will consume 24 watts of power.

Conversion For AC Circuits

Converting voltage to wattage in AC electrical circuits uses the same formula with some slight modifications. This is because AC circuit power is comprised of a real power component, measured in watts (W), and a reactive power component, measured in volt-amps reactive (VAR).

Together, these components are called apparent power and are measured in volt-amps (VA). The real power component is the power that does the work, whereas reactive power is usually undesirable because it generates excess load on the transmission components. The ratio of real power to apparent power is called the power factor.

Formula for AC Circuits

To account for power factor when converting volts to watts, you can use the following formula:

P(W) = V(V) × I(A) × PF

Thus, in AC circuits, power P in watts is equal to the RMS voltage V times the current I in amps times the power factor.

For example, let’s convert 120 volts to watts for an AC electrical circuit with 15 amps of current and a power factor of .9.

P(W) = 120 V × 15 A × .9 P(W) = 1,620 watts

In this example, 120 volts will consume 1,620 watts of power.

Convert Volts to Watts using Resistance

It’s also possible to convert volts to watts for a simple resistive load if you know the resistance of the circuit. Use this formula to convert volts to watts using the resistance.

P(W) = V(V)2 ÷ R(Ω)

Thus, the power P in watts is equal to voltage V squared, divided by the resistance R in ohms.

For example, let’s convert 24 volts to watts for a DC circuit with 12 ohms of resistance.

P(W) = (24 V)2 ÷ 12 Ω P(W) = 576 V ÷ 12 Ω P(W) = 48 watts

The result is 48 watts.

Equivalent Volts and Watts Measurements

Equivalent volts and watts at various current ratings

Voltage	Power	Current
1 volt	1 watt	1 amp
1 volt	2 watts	2 amps
1 volt	3 watts	3 amps
1 volt	4 watts	4 amps
2 volts	2 watts	1 amp
2 volts	4 watts	2 amps
2 volts	6 watts	3 amps
2 volts	8 watts	4 amps
3 volts	3 watts	1 amp
3 volts	6 watts	2 amps
3 volts	9 watts	3 amps
3 volts	12 watts	4 amps
4 volts	4 watts	1 amp
4 volts	8 watts	2 amps
4 volts	12 watts	3 amps
4 volts	16 watts	4 amps
5 volts	5 watts	1 amp
5 volts	10 watts	2 amps
5 volts	15 watts	3 amps
5 volts	20 watts	4 amps
6 volts	6 watts	1 amp
6 volts	12 watts	2 amps
6 volts	18 watts	3 amps
6 volts	24 watts	4 amps
7 volts	7 watts	1 amp
7 volts	14 watts	2 amps
7 volts	21 watt	3 amps
7 volts	28 watts	4 amps
8 volts	8 watts	1 amp
8 volts	16 watts	2 amps
8 volts	24 watts	3 amps
8 volts	32 watts	4 amps
9 volts	9 watts	1 amp
9 volts	18 watts	2 amps
9 volts	27 watts	3 amps
9 volts	36 watts	4 amps
10 volts	10 watts	1 amp
10 volts	20 watts	2 amps
10 volts	30 watts	3 amps
10 volts	40 watts	4 amps
11 volt	11 watt	1 amp
11 volt	22 watts	2 amps
11 volt	33 watts	3 amps
11 volt	44 watts	4 amps
12 volts	12 watts	1 amp
12 volts	24 watts	2 amps
12 volts	36 watts	3 amps
12 volts	48 watts	4 amps
24 volts	24 watts	1 amp
24 volts	48 watts	2 amps
24 volts	72 watts	3 amps
24 volts	96 watts	4 amps
48 volts	48 watts	1 amp
48 volts	96 watts	2 amps
48 volts	144 watts	3 amps
48 volts	192 watts	4 amps
120 volts	120 watts	1 amp
120 volts	240 watts	2 amps
120 volts	360 watts	3 amps
120 volts	480 watts	4 amps
240 volts	240 watts	1 amp
240 volts	480 watts	2 amps
240 volts	720 watts	3 amps
240 volts	960 watts	4 amps

Learn more Ohm’s Law electrical formulas and see more conversions on our Ohm’s Law calculator.